Dear Ewen,
Check out Biran online Web page.You will find a number of dvds by Chiba Sensei and visiting instructors.
I also sell dvds .Contact British Birankai Webpage.
Again the Dvds are by Chiba Sensei , Miyamoto Sensei, Etsuji Horii Sensei,to name but a few.
I also have samples of Batto Ho, Weapons etc. Cheers, Joe.